2.6 – Network Connections :DHCP Configuration
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Questions and Answers

Which configuration setting is used to specify how long a workstation can use the same IP address?

  • IP Address Range
  • DNS Server Settings
  • Lease Duration (correct)
  • Subnet Mask

    • What does a DHCP server use to determine which IP addresses it can assign?

  • A predefined list of MAC addresses
  • A configured IP address range and subnet mask (correct)
  • The current list of connected devices
  • A manually updated list of available IP addresses

    • Which of the following is NOT typically configured directly within a DHCP server?

  • Voice over IP server options
  • Operating System of the host device (correct)
  • Default gateway setting
  • DNS server IP addresses

    • What actions can a network administrator perform using a DHCP server's address pool?

    <p>Exclude or reserve specific IP addresses within the range</p> Signup and view all the answers

    In addition to IP addresses, what else does a DHCP server configure for devices on the network?

    <p>DNS server settings and default gateway</p> Signup and view all the answers

    What is meant by a 'DHCP reservation'?

    <p>A specific IP address assigned to a specific device</p> Signup and view all the answers

    Besides a Windows Server, where might you find a DHCP server in a home or small office setting?

    <p>On an embedded router</p> Signup and view all the answers

    What does the term 'IP scope' generally refer to in the context of DHCP?

    <p>The range of IP addresses available for assignment</p> Signup and view all the answers

    What range of IP addresses would a DHCP server assign, given a start address of 10.10.10.2 and an end address of 10.10.10.100?

    <p>From 10.10.10.2 to 10.10.10.100</p> Signup and view all the answers

    If a DHCP server lease time is configured for 86,400 seconds, how long is the lease in hours?

    <p>24 hours</p> Signup and view all the answers

    Besides IP address and lease time, what other configuration values are mentioned in the content as being assigned by the DHCP server?

    <p>Gateway and DNS configurations</p> Signup and view all the answers

    What is a dynamic DHCP assignment?

    <p>A temporary assignment of an IP address from an available pool</p> Signup and view all the answers

    What is the purpose of a DHCP address reservation?

    <p>To ensure a device always receives the same IP address.</p> Signup and view all the answers

    What is the basis of configuring a DHCP address reservation?

    <p>MAC address</p> Signup and view all the answers

    What is the result of an expired DHCP lease?

    <p>The IP address will be released and available for other devices.</p> Signup and view all the answers

    What is the purpose of the T1 timer in a DHCP lease process?

    <p>To ensure the device still needs the same IP Address</p> Signup and view all the answers

    When does the T1 timer typically activate during a lease period?

    <p>Halfway through the lease</p> Signup and view all the answers

    When does the T2 timer activate during a lease period?

    <p>After a period of time has elapsed, after the T1 timer has not been able to renew</p> Signup and view all the answers

    What happens after a device successfully contacts the DHCP server after the T1 timer?

    <p>The lease time is reset and a new lease period begins.</p> Signup and view all the answers

    If the lease time is 8 days, when would the T2 timer activate, assuming the T1 check didn’t occur?

    <p>After 7 Days</p> Signup and view all the answers

    What does a device do if it cannot reach the DHCP server after multiple attempts during the T2 timer?

    <p>The lease is terminated and the IP address is released.</p> Signup and view all the answers

    What is the name for a DHCP assignment which ensures a device always receives the same IP and it is never given to another device?

    <p>DHCP reservation</p> Signup and view all the answers

    Study Notes

    DHCP Server Configuration

    • IP Address Range: DHCP server needs a defined IP address range (e.g., 192.168.1.0/24) for assignment.
    • Subnet Mask: The subnet mask associated with the IP range is crucial.
    • Lease Duration: Configure how long a device can hold an IP address.
    • DNS Server: Configure the DNS server IP address for clients.
    • Default Gateway: Configure the default gateway IP address.
    • Optional Configurations: Include settings for VoIP gateways and other network services.

    DHCP Server Functionality and Operation

    • Address Pool: The DHCP server selects from an available IP address pool.
    • IP Scopes: DHCP server can manage large contiguous IP address ranges.
    • DHCP Reservations: Exceptions can be made to exclude specific IP addresses.

    DHCP Server Examples

    • Windows Server DHCP: DHCP Server on a Windows Server device.

      • Scope: Defines the IP address range handled by the DHCP server (e.g., 165.245.44.0).
      • Address Pools: Inside the scope, defined address pools for assigning.
      • Address Leases: The server keeps record of previously assigned IPs.
      • IP Reservations: Explicitly assign a specific IP to a device.
      • Scope Options: Add additional parameters like VoIP gateway addresses.

    • Embedded Router DHCP: DHCP server on an embedded router.

      • Example Scope: 10.10.10.2 to 10.10.10.100.
      • Lease Time: Measured in seconds (e.g., 86,400 seconds = 24 hours).
      • Gateway: Configure default gateway IP address(e.g., 10.10.10.1).
      • DNS Configuration: Configure DNS settings for end devices.

    DHCP Address Assignment

    • Dynamic Assignment: Devices receive a temporary IP address from the pool.
    • Automatic Reassignment: Previous IP assignment will be reused if available.
    • DHCP Reservation: Allows a device to always receive the same IP (usually linked to a MAC address).
    • Static Assignment: Another term for DHCP reservation.
    • IP Reservation: Another term for DHCP reservation.

    DHCP Lease Management

    • Lease Expiration: Assigned IP address is returned to the pool after the lease expires.
    • T1 Timer: Checks in with the server halfway through the lease period.
    • T2 Timer: Attempts to rebind with a redundant DHCP server nearing the lease end.
    • Reallocation: Device renews lease or manually releases IP.
    • Rebinding: Device attempts to re-acquire the original IP on loss of the initial DHCP server.
    • MAC Address: Used to permanently assign DHCP addresses.

    DHCP Lease Time Example

    • Lease Time: 8 days
    • T1 Timer: 4 days (50% of lease time)
    • T2 Timer: 7 days (7/8 of lease duration)

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    Description

    This quiz covers the essentials of DHCP server configuration, including IP address ranges, subnet masks, and lease durations. It also explores DHCP functionality, such as managing IP address pools and reservations, along with examples like Windows Server DHCP. Test your knowledge of these critical networking concepts!

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